This cartoon of Isaac Newton (1643--1727) is based on the Portrait of Isaac Newton (1689) by Godfrey Kneller (1646--1723).

The portrait was painted just after Newton published Philosophiae Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy") (1687) which presented Newtonian physics and the first physically-correct description of Solar System (in the Book III: De mundi systemate (On the System of the World):